Error: The tool was unable to install SQL 2008 R2 Reporting Services SharePoint 2010 add-in. Install process returned (0X643=1603). Applies to the codeplex Powershell scripted install.Fix: Only info I found suggested a re-run fixes the error. Simply re-running the prerequisite installer did not fix the issue for me. A similar error suggesting that i am using the incorrect version of rsSharepoint.msi relating to the Genva framework (claims) not Reporting Services. I tried manually installing the Reporting services rsSharePoint.msi, it kept failing. I also tried rsSharePoint_x64.msi, also failed.
Next I ran SharePoint install manually after the manual prerequisites was run as Administrator, failed.

Noticed I had 2 rsSharePoint.msi that are of a different size? The file I used on 2 Sept 2010 on my Win 2008 R2 WFE was 36.9MB in size, my other was 39MB. rsSharePoint.msi download

I use the version off the SQL media for getting Reporting Services wirking in the SharePoint mode.

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comments:

If you can't install rsSharePoint.msi (running in admin mode), ensure you have the right version. MS has 2 different verions of the file. I have asked MS to fix/clarify on the issue.The correct version is 36.9MB can be found at http://go.microsoft.com/fwlink/?LinkId=192588